The factory barrel on the Mini's most likely cost Ruger less than a Final Finish lapping kit would cost you. Although I haven't done it yet firelapping my barrel is high on my list. I doubt if it'd improve accuracy but a clean bore is a help. Something else I've been thinking about is having the barreled action cryo'd. I can't help but believe that there is probably a lot of stress built up in turning that barrel down so skinny.
Just my 2¢
Bushwack
Just my 2¢
Bushwack
